A product is sold in three sizes: 200 g for R12, 400 g for R22 and 600 g for R36. Which size is the cheapest per gram?

Answer and explanation

Correct answer: B. 400 g for R22

  1. Step 1: Divide each price by its mass: R12/200 g = R0,0600 per g; R22/400 g = R0,0550 per g; R36/600 g = R0,0600 per g.
  2. Step 2: The smallest value is for the 400 g size.
Answer
400 g for R22.
Why not the others: 200 g for R12: this size is not the cheapest per gram. 600 g for R36: this size is not the cheapest per gram. All three cost the same per gram: the prices per gram are different.

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